<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>浮动练习</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        .box {
            width: 1226px;
            height: 615px;
            background-color: antiquewhite;
            margin: 50px auto;
        }
        
        .top {
            width: 234px;
            height: 615px;
            float: left;
            background-color: aquamarine;
        }
        
        .xia {
            width: 992px;
            height: 615px;
            float: right;
            background-color: whitesmoke;
        }
        
        .fd {
            width: 234px;
            height: 300px;
            float: left;
            margin-left: 14px;
            margin-top: 5px;
            background-color: red;
        }
    </style>



</head>

<body>

    <div class="box">
        <div class="top"></div>
        <div class="xia">
            <div class="fd"></div>
            <div class="fd"></div>
            <div class="fd"></div>
            <div class="fd"></div>
            <div class="fd"></div>
            <div class="fd"></div>
            <div class="fd"></div>
            <div class="fd"></div>
            <div class="fd"></div>
            <div class="fd"></div>
            <div class="fd"></div>
            <div class="fd"></div>

        </div>





    </div>




</body>

</html>